if params[:amount].blank? || params[:amount].to_f == 0.0
        flash[:notice] = "Invalid Amount, you need to specify a number greater than zero & with no decimals"
        redirect_to new_challenge_donations_path
      end
      if charge["paid"] == true
        saved = @donation.save
        redirect_to root_path
        flash[:notice] = "Thanks for your donation, Feel free to donate again."
      end